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The starting flow around a uniformly accelerated circular cylinder is investigatedby flow visualization techncque and solving N-S equations numerically in detail.The results ofthe starting flow are similar with those of the impulsively started one.At lower Re_α,numbers the“phenomenon a”is revealed;the“phenomenon β”appears at higher Re_α numbers,but withonly one secondary vortex.At the early stage of the starting vortex formation,the flow islaminar;at the later stage,the flow transforms into turbulent flow.The velocity distribution inthe flow field is measured with the multiwires installment.The calculational results are comparedwith the results of experiment,and both are in agreement with each other.
The starting flow around a uniformly accelerated circular cylinder is investigated by flow visualization techncque and solving NS equations numerically in detail. The results of the starting flow are similar with those of the impulsively started one. At lower Re_α, numbers the “phenomenon a” is revealed; the “phenomenon β” appears at higher re_α numbers, but with only one secondary vortex. At the early stage of the starting vortex formation, the flow islaminar; at the later stage, the flow transforms into turbulent flow. The velocity distribution inthe flow field is measured with the multiwires installment. calculational results are comparedwith the results of experiment, and both are in agreement with each other.